Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f1557e6f1f6c27…

MALICIOUS

PDF

37.6 KB Created: 2020-08-31 22:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35016df5957cc2bba4c1e47fbfcc71f6 SHA-1: 3a89ed27bb0f63631f29961661787c71cd079215 SHA-256: 81f1557e6f1f6c2772e1dc554d52e7fd8f3b2a9ccc321f779577ed9084715dde
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised as information about Botswana postal codes. The document also functions as a link farm, pointing to numerous other PDFs hosted on Shopify and static hosting sites. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=botswana+postal+code+format
    • https://cdn.shopify.com/s/files/1/0438/3057/5266/files/xorifem.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/44984367734.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8638/files/open_dns_server.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9399/files/air_force_entrance_exam_paper.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/zivajebukudini.pdf
    • https://static.usrfiles.com/ugd/b8c837_45efedfe25864268ad47df863318a9b9.pdf
    • https://static.usrfiles.com/ugd/73c254_d83097b17d1e4e4e87e4d511a98f5deb.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbdc8e6b6902448cb83e89134be9ba4f.pdf
    • https://static.usrfiles.com/ugd/eda9ba_e94b2a3b78a24b378a12de1e5c66b2e0.pdf
    • https://static.usrfiles.com/ugd/d63aaf_03abf9d4fadf4c31836c93629c2a4b03.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005516.bin
5e87445b71e8ca7d92c4bb6c29c9bf88897a39fe12884949dac0fbc9e01c0cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5516 5444 bytes
font_01_sfnt_off00006798.bin
767569a45e309bd7ebe459ff42c02e94d09cb61e91acb2d25219c9eb04c06b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6798 10136 bytes

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